package com.carloha.finance.tool;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpUtil2 {
	/**
	 * 从网络Url中下载文件
	 * @param urlStr
	 * @param fileName
	 * @param savePath
	 * @throws IOException
	 */
	public static void  downLoadFromUrl(String urlStr,String fileName,String savePath) throws IOException{
	    URL url = new URL(urlStr);
	    HttpURLConnection conn = (HttpURLConnection)url.openConnection();
	    //设置超时间为3秒
	    conn.setConnectTimeout(3*1000);
	    //防止屏蔽程序抓取而返回403错误
	    conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
	    //得到输入流
	    InputStream inputStream = conn.getInputStream();
	    //获取自己数组
	    byte[] getData = readInputStream(inputStream);

	    //文件保存位置
	    File saveDir = new File(savePath);
	    if(!saveDir.exists()){
	        saveDir.mkdir();
	    }
	    File file = new File(saveDir+File.separator+fileName);
	    FileOutputStream fos = new FileOutputStream(file);
	    fos.write(getData);
	    if(fos!=null){
	        fos.close();
	    }
	    if(inputStream!=null){
	        inputStream.close();
	    }


	    System.out.println("info:"+url+" download success");

	}
	
	/**
	 * 从输入流中获取字节数组
	 * @param inputStream
	 * @return
	 * @throws IOException
	 */
	public static  byte[] readInputStream(InputStream inputStream) throws IOException {
	    byte[] buffer = new byte[1024];
	    int len = 0;
	    ByteArrayOutputStream bos = new ByteArrayOutputStream();
	    while((len = inputStream.read(buffer)) != -1) {
	        bos.write(buffer, 0, len);
	    }
	    bos.close();
	    return bos.toByteArray();
	}    
	
	public static void main(String[] args) {
	    try{
	        downLoadFromUrl("https://static.dingtalk.com/media/lADPDgQ9q0S9lobNA8DNBQA_1280_960.jpg",
	                "lADPDgQ9q0S9lobNA8DNBQA_1280_960999.jpg","G:/tmp1");
	    }catch (Exception e) {
	        // TODO: handle exception
	    }
	}
}
